Which of the following causes the least pollution when burnt?

Petrol

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Natural gas

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Coal

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Diesel

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Solution

The correct option is C Natural gas
Natural gas mainly contains methane.

Combustion of one molecule of methane with two oxygen molecules reacts to form one carbon dioxide molecule and two water molecules usually are given off as steam or water vapor during the reaction and energy. Natural gas is the cleanest burning fossil fuel.

$C H_{4} + 2 O_{2} \to C O_{2} + 2 H_{2} O$

Option B is correct.

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